see bold...therefore the problem is asking if you pick 4 numbers from 1,2,3,4,5,6,7,8,9 then what is the probability that you pick includes 2 (OR ANY EVEN NUMBER) and 7.
Keep in mind that the machine can pick the same number up to 4 times.
Phrased differently: What's the probability that you pick AT LEAST ONE 7 and AT LEAST an even number out of 4 times?Hi,
This is a mathcount math contest problem. The answer is 2096/6561.
Divisibility rule of 14 is the number is divisible by 2 and by 7. I know hat 6561 is 9^4.
Besides that I don't know how to proceed, can someone give my some hints.
thanks!
...therefore the problem is asking if you pick 4 numbers from 1,2,3,4,5,6,7,8,9 then what is the probability that you pick includes 2 (OR ANY EVEN NUMBER) and 7.
Keep in mind that the machine can pick the same number up to 4 times.
OUCH!see bold